PHP Judgment string encoding function _php Tutorial

Character encoding judgment is something we use all the time, especially when I want to judge what the user has entered or submitted by the character encoding to be effectively processed, let me introduce you to PHP judgment string encoding function

Mb_detect_encoding () ($STR);

The code is as follows	Copy Code
Determine what encoding a string is if ($tag = = = Mb_convert_encoding (mb_convert_encoding ($tag, "GB2312", "UTF-8"), "UTF-8", "GB2312")) { } else {//if the gb2312 is converted to UTF8 $tag = mb_convert_encoding ($tag, ' UTF-8 ', ' GB2312 '); }

The function can detect the encoding but using this function must open PHP's Extension=php_mbstring.dll extension if everyone is using space and not modified

PHP.ini Configuration folder permissions will there be better functions to check the string encoding, promise is yes

Determine if a string is UTF-8 encoded

The code is as follows

Copy Code

/** +---------------------------------------------------------- * Check if the string is UTF8 encoded +---------------------------------------------------------- * @param string $string strings +---------------------------------------------------------- * @return Boolean +---------------------------------------------------------- */ function Is_utf8 ($string) { Return Preg_match ('%^ (?: [x09x0ax0dx20-x7e] # ASCII | [XC2-XDF] [X80-XBF] # Non-overlong 2-byte | XE0[XA0-XBF][X80-XBF] # excluding overlongs | [Xe1-xecxeexef] [X80-XBF] {2} # straight 3-byte | XED[X80-X9F][X80-XBF] # excluding surrogates | XF0[X90-XBF][X80-XBF]{2} # Planes 1-3 | [Xf1-xf3] [X80-XBF] {3} # planes 4-15 | XF4[X80-X8F][X80-XBF]{2} # Plane 16 ) *$%xs ', $string); }

Can you check out GB2312 or UTF-8?

	copy code
function is_gb2312 ($str) { for ($i = 0; $i $v = Ord ($str [$i]), if ($v > 127) { if (($v >= 228) && ($v <= 233)) { If (($i +2) >= (strlen ($STR)-1)) return true; Not enough Characters $v 1 = ord ($str [$i +1]), $v 2 = Ord ($str [$i +2]), if (($v 1 >=) && ; ($v 1 <=191) && ($v 2 >=128) && ($v 2 <= 191)//UTF Encoding return false; Else Retur n true; } } } return true; }

Some friends say you can use the Mb_check_encoding function to check, this I have not tested everyone can test it yourself oh.

http://www.bkjia.com/PHPjc/630722.html www.bkjia.com true http://www.bkjia.com/PHPjc/630722.html techarticle character encoding judgment is something that we use all the time, especially when I want to judge what the user has entered or the character that is being submitted is encoded so that it can be effectively processed, let me give the big ...

